(57) A cap particularly suited for the airtight sealing of bottles includes two essentially
cylindrical bodies (10, 20), the one being inside the other, coaxial and reciprocally
sliding. The inside body presents a series of horizontally mobile elements (15),
distributed inside a circular crown, which are connected with holes or with radial
slots and which can protrude inwards under the pressure exerted by the action of the
outside body (20), when said body is caused to slide downwards. The mobile elements,
which can have the shape of balls, stop in this case against the indented lower edge
(31) of the bottle neck and insure thereby the tight grip of the cap. In order to
obtain the release of the cap it suffices to lightly press the inside body downwards
and push the outside body upwards, so as to allow the mobile elements to re-enter
their seats. A safety stop of the cap on the bottle is obtained, when the cap is already
closed on the bottle, by rotating the outside body.
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